Added mailboxes as local data sources (#1022)

app/Tests/Tools/DataSourceReindexWarningTests.cs

@@ -0,0 +1,39 @@
+using AIStudio.Settings;
+using AIStudio.Settings.DataModel;
+using AIStudio.Tools;
+
+using Microsoft.Extensions.Logging.Abstractions;
+
+namespace AIStudio.Tests.Tools;
+
+/// <summary>
+/// Checks which data sources the warnings about an embedding provider name.
+/// </summary>
+/// <remarks>
+/// Mailboxes live in a list of their own, next to the data sources. An embedding provider serves
+/// both, so deleting it costs a mailbox just as much, and the warning has to say so.
+/// </remarks>
+[TestFixture]
+public sealed class DataSourceReindexWarningTests
+{
+    private const string EMBEDDING_ID = "5c0e8a4f-2d6b-4e1a-9f3c-7b8d9e0a1b2c";
+
+    [Test]
+    public void DeletingAnEmbeddingProviderNamesTheMailboxesUsingIt()
+    {
+        var settingsManager = new SettingsManager(NullLogger<SettingsManager>.Instance, null!);
+        var embeddingProvider = new EmbeddingProvider() with { Id = EMBEDDING_ID, Name = "Local embedding" };
+
+        settingsManager.ConfigurationData.DataSources.Add(new DataSourceLocalDirectory { Id = Guid.NewGuid().ToString(), Name = "Reports", Type = DataSourceType.LOCAL_DIRECTORY, EmbeddingId = EMBEDDING_ID });
+        settingsManager.ConfigurationData.Mailboxes.Add(new DataSourceMailbox { Id = Guid.NewGuid().ToString(), Name = "Work mail", EmbeddingId = EMBEDDING_ID });
+        settingsManager.ConfigurationData.Mailboxes.Add(new DataSourceMailbox { Id = Guid.NewGuid().ToString(), Name = "Private mail", EmbeddingId = Guid.NewGuid().ToString() });
+
+        var description = DataSourceReindexWarning.DescribeDataSourcesLosingTheirProvider(settingsManager, embeddingProvider);
+        Assert.Multiple(() =>
+        {
+            Assert.That(description, Does.Contain("- Reports"), "The data source using the provider is not named.");
+            Assert.That(description, Does.Contain("- Work mail"), "The mailbox using the provider is not named.");
+            Assert.That(description, Does.Not.Contain("Private mail"), "A mailbox using another provider is named.");
+        });
+    }
+}